TWI481214B - Antenna switching method of wireless communication system - Google Patents

Description

Antenna conversion method for wireless communication system

The present invention relates to an antenna conversion method for a wireless communication system that transmits and receives signals from an antenna that selects a good communication quality state from a plurality of antennas, and more particularly to a signal transmission and reception that can establish a communication state in advance and perform stability. The antenna conversion method of the wireless communication system which can suppress the battery consumption.

The applicant proposes a method of transmitting a signal side in a tightening torque measuring unit mounted on a rotating shaft of a locker or the like, and can transmit a locking information such as a torque value or a rotation angle by wireless. To the wireless communication system that receives the signal side means.

However, the locking torque measuring unit has the number of antennas on the transmitting signal side. On the other hand, the locking torque measuring unit rotates integrally with the rotating shaft, so that the signal side antenna is transmitted according to the stopping position of the locking torque measuring unit. When moving to a position where the communication quality status of the receiving signal side is deteriorated, there is a possibility that the transmission and reception signals of the signal received by the signal side are not smooth.

Although it is possible to sequentially transmit a plurality of transmission signal side antennas to sequentially transmit signals (for example, refer to Japanese Patent Laid-Open Publication No. 2000-353998), in this case, there is a case where transmission and reception signals in a state in which communication quality is poor are repeated at regular intervals. problem.

Therefore, it is conceivable to provide a plurality of transmission signal side antennas to the locking torque measuring unit and to transmit the locking information together from all the transmitting signal side antennas, but since the locking torque measuring unit rotates integrally with the rotating shaft as described above, Therefore, it is necessary to use a battery as a power source to drive, and once the power consumption is increased, there is a problem that the battery consumption becomes faster.

These problems are not limited to the torque measuring unit, and are particularly urgently desired to be solved in a wireless communication system that needs to sequentially transmit various signals.

An object of the present invention is to provide an antenna conversion method for wirelessly transmitting a plurality of signals from a plurality of transmission signal side antennas to a signal receiving side signal, and particularly to provide an antenna conversion method suitable for a wireless communication system. The wireless communication system is a transmission signal side means or a battery-driven transmission signal side means in which a plurality of transmission signal side antennas are provided to a rotatable member.

In order to solve the above problem, the antenna conversion method of the wireless communication system of the present invention has a transmission signal side means having: a transmission signal side circuit for transmitting and receiving signals, and a plurality of transmission signal side antennas for transmitting and receiving signals, And an antenna converter that converts any one of the plurality of transmission signal side antennas to the transmission signal side circuit, and a transmission signal side control means that controls the transmission signal side circuit and the antenna converter, and transmits the signal side The circuit system can transmit a signal including the response request and send and receive other signals; and receive the signal side means, and have a receiving signal side circuit for transmitting and receiving the signal with the transmitting signal side means, and being connected to the receiving signal The receiving signal side antenna of the side circuit and the receiving signal side control means for controlling the receiving signal side circuit, and the receiving signal side control means transmitting the reply signal from the receiving signal side circuit when receiving the signal including the reply request from the transmitting signal side means, The method has the following steps: a receiving signal strength measuring step, and a binding package The transmission signal side control means operates the antenna converter in such a manner as to be able to connect either of the transmission signal side antenna and the transmission signal side circuit, and transmits the signal including the response request from the transmission signal side circuit via the transmission signal side antenna. The receiving signal is in standby state, and once the receiving signal side control means receives the signal including the reply request, the reply signal is sent from the receiving signal side circuit via the receiving signal side antenna, and the transmitting signal side control means memorizes the foregoing sending in the predetermined time. The step of receiving the signal strength of the response signal received by the signal side antenna, and operating the antenna converter, performing the foregoing steps for all the remaining signal side antennas, and obtaining the received signal strength for all the signal side antennas; The signal side control means compares the received signal strengths of all the transmitted signal side antennas, determines the step of transmitting the signal side antenna with the highest received signal strength, and transmits the signal side control means to connect the determined received signal strength to the highest Sending signal The antenna and the signal-side circuit operate the antenna converter to fix the signal-side antenna; and the signal-side control means causes the signal from the subsequent transmission-signal circuit to pass through the fixed transmission-side antenna. The step of sending.

The transmitting signal side means operates the antenna converter in such a manner as to sequentially transmit and receive the signal including the response request from all the transmitting signal side antennas, and measures the received signal strength from the receiving signal side means for each of the transmitting signal side antennas. As a result, the transmission signal side antenna that obtains the highest received signal strength can be selected to fix the transmission signal side antenna, so that the method of generating the transmission and reception signal failure can be optimized.

Further, since the transmission signal side antenna is fixed, only the transmission signal side antenna transmits the signal, so that the communication state can be established in advance, and the stable signal can be transmitted and received, thereby achieving battery consumption suppression or wireless frequency space. The share of the share is low.

Hereinafter, an embodiment in which the transmission signal side means (20) of the wireless communication system (10) of the present invention is mounted on the locking torque measuring means (30) will be described with reference to the drawings, the locking torque measuring unit (30) It can be mounted on the shaft (50) of the locking machine.

However, the transmitting signal side means (20) is not limited to the application to the locking torque measuring unit (30), and is also suitable for mounting other members, particularly rotatable members.

1 is a block diagram of a wireless communication system (10) of the present invention. The wireless communication system (10) of the present invention has a transmission signal side means (20) for transmitting various signals, and a reception signal side means (40) for receiving signals from the transmission signal side means (20). The transmitting signal side means (20) is constructed by being equipped with a locking torque measuring unit (30) as shown in FIG.

<Send signal side means (20)>

The transmission signal side means (20) has a transmission signal side circuit (22) (RF circuit) for transmitting and receiving signals, and a plurality of transmission signal side antennas (24) (25) for transmitting and receiving signals as shown in FIG. The following is an explanation of an embodiment in which two transmitting signal side antennas (transmitting the signal side antenna 1 (24) and transmitting the signal side antenna 2 (25)) are used, but the number of transmitting signal side antennas may be three or more.

The power supply to the transmission signal side means (20) can be performed by a battery omitted from the drawing.

The transmission signal side means (20) can be accommodated in an appropriate position in the cylindrical casing (35) of the locking torque measuring unit (30) to be described later. As shown in FIG. 2, it is preferable that the transmission signal side antenna 1 (24) and the transmission signal side antenna 2 (25) are provided near the outer periphery of the casing (35) at every predetermined interval, and the case of the embodiment is provided with an axis. The opposite direction is provided, and the adjacent antenna is disposed in the diagonal direction so as to be apart from the 1/2 wavelength or more of the used wireless communication frequency.

The transmitting signal side antenna (24) (25) can be electrically connected to the transmitting signal side circuit (22) by switching either of them via the antenna converter (23).

The transmission signal side circuit (22) and the antenna converter (23) are controlled by transmitting signal side control means (21).

The transmission signal side control means (21) can be constituted by a CPU, a memory or the like, and performs processing of output from a detection sensor (31) to be described later, and processing of various signals transmitted from the transmission signal side circuit (22) via Each of the transmitting signal side antennas (24) (25) receives the measurement of the received signal strength of the response signal, memorizes, compares, and selects the signal side antenna (24) (25), and operates the antenna converter (23) to perform The transmission of the signal-side antenna (24) or (25) of the signal should be transmitted. The signal transmitted from the transmission signal side circuit (22) may be exemplified by a signal including a response request and/or a lock information detected by the detection sensor (31) to be described later.

The operation of the transmission signal side control means (21) will be described in detail below using flowchart 3 and sequence diagram 4.

<Lock torque measuring unit>

The locking torque measuring unit (30) provided in the transmitting signal side means (20) is detachably or fixedly mounted to the rotating shaft (50) of the locking machine as shown in FIG. The locking torque measuring unit (30) surrounds the outer circumference by the outer casing (35), and is equipped with the above-mentioned transmitting signal side means (20), and as shown in FIG. 1, has electrical detection acting on the rotating shaft (50). The torque detecting sensor (31), and the amplifier (32) for amplifying the locking information output from the detecting sensor (31), and the locking information to be amplified are A/D-converted The A/D converter (33), which is digitally signaled by the A/D converter (33), is sent to the transmission signal side control means (21).

The detecting sensor (31) for measuring the locking information can take a strain gauge (Strain Gauge) as an example when measuring the locking torque as the locking information. Further, when the information on the rotation angle is measured as the lock information, an encoder, a gyro sensor, a photo interrupter, or a magnetic sensor may be exemplified. Further, as the encoder or the photointerrupter, if it is a detecting sensor (31) for outputting a digital signal, the A/D converter (33) can be omitted.

The detecting sensor (31) is not limited to the above, and of course, various types can be used.

Hereinafter, the torque will be described as an example of the locking information.

The locking torque measuring unit (30) may be driven by a battery (not shown) provided in the casing (35) as a power source. Further, the battery may be configured to be shared with the transmission signal side means (20).

Further, the locking torque measuring unit (30) is provided with a display means (36) as shown in Fig. 2, and the locking information can be directly seen.

<Receive signal side means (40)>

The reception of the signal transmitted from the transmission signal side means (20) can be performed by the reception signal side means (40) shown in FIG.

The receiving signal side means (40) has a receiving signal side antenna (43), a receiving signal side circuit (42) (RF circuit), and a receiving signal side control means (41). The signal transmitted from the transmission signal side means (20) is received by the reception signal side control means (41) via the reception signal side antenna (43) and the reception signal side circuit (42).

The receiving signal side control means (41) transmits the RSSI value (received signal strength value) from the receiving signal side circuit (42) via the receiving signal side antenna (43) every received signal including the answer request in the received signal standby state. ) The reply signal.

By receiving the memory (not shown) in the receiving signal side control means (41) or connecting the display means (45), the received locking information can be memorized in the memory or displayed on the display means (45). ).

By including the machine identification number or time of the locking torque measuring unit (30), the position information of the locking place, etc. in the signal about the locking information sent from the transmitting signal side means (20), it can be helpful in receiving The signal side displays or manages the lock information.

The reception signal side means (40), the display means (45), and the like can be configured to be driven by a commercial power source or a battery as a power source.

<Action Description>

The operation of the antenna converter (23) receiving the signal side means (40) will be described with reference to the flowchart 3 and the sequence diagram 4 for the wireless communication system (10) having the above configuration.

Insert the front end socket (51) of the shaft (50) of the locker into the bolt or nut and start to lock.

The detecting sensor (31) detects the torque acting on the rotating shaft (50), amplifies it by the amplifier (32), and performs A/D conversion by the A/D converter (33) to transmit the signal to the transmitting signal. Side control means (21) (step 1).

Until the locking information detected by the detecting sensor (31) meets the predetermined condition, in the case of the present embodiment, the transmitting signal side control means (21) does not become until the torque value becomes a predetermined critical value or more. The torque value is transmitted from the transmission signal side circuit (22) (step 1). Since the rotating shaft (50) rotates when the torque value is below a predetermined critical value, the position of the locking torque measuring unit (30), that is, the position of the transmitting signal side antenna (24) (25) in the rotational direction is undetermined.

Once the locking is continued, the torque rises and exceeds the predetermined threshold (step 1), the rotation shaft (50) of the locking machine hardly rotates, and the locking torque measuring unit (30) attached to the rotating shaft (50) also The position in the direction of rotation is also almost fixed. Therefore, the position of the transmission signal side antenna (24) (25) is also formed.

In this state, the transmission signal side control means (21) operates the antenna converter (23) to set any of the transmission signal side antennas (24) (25) connected to the transmission signal side circuit (22) (step 2, action) 1: For example, the transmission signal side antenna 1 (24) and the transmission signal side circuit (22) are connected. In addition, in this state, the transmission of the signal has not yet been performed.

In a state where the transmission signal side antenna 1 (24) and the transmission signal side circuit (22) are connected, the transmission signal side control means (21) resets the held RSSI integrated value to zero. Further, the received signal intensity integrated value on the transmitting signal side antenna 1 (24) side is set to RSSI1, and the received signal strength integrated value on the transmitting signal side antenna 2 (25) side is set to RSSI2.

The transmission signal side control means (21) inputs the torque value in sequence for each predetermined time (step 4), and when the predetermined measurement value transmission timing comes (step 5), it is transmitted in fixed (steps 16 and 17 to be described later). When the signal side antenna (24) (25) is not in progress (step 6), the transmission signal side control means (21) transmits the response request and the torque from the transmission signal side circuit (22) via the transmission signal side antenna 1 (24). Value signal (step 8, action 2). Thereby, the measurement of the RSSI of each of the transmission signal side antennas (24) (25) is started (received signal strength measuring step).

Further, as the measurement value transmission timing of the step 5, a timing at which the torque value is input a predetermined number of times (for example, 10 times) can be exemplified.

Once the receiving signal side means (40) receives the signal including the response request (Act 3), the receiving signal side control means (41) answers the received signal from the receiving signal side circuit (42) via the receiving signal side antenna (43). Intensity value (RSSI) signal (answer signal) (action 4).

Once the transmitting signal side means (20) receives the reply signal via the transmitting signal side antenna 1 (24) (step 9, action 5), the antenna number of the received transmitting signal side antenna is updated (this case is the transmitting signal side antenna 1) (24)) RSSI cumulative value (RSSI1) (step 11). RSSI1 is calculated by accumulating the received RSSI at the value of the original RSSI1 (initially zero).

Here, the next step 13 is to determine whether to perform selection and fixation of the transmission signal side antenna (24) (25) by detecting whether the sum of the RSSI values of the two antennas is larger than a predetermined threshold value (step 14, step). Steps 16 and 17). This will be described later.

When the response signal is received within the specified time and the sum of the RSSI values of the two transmitting signal side antennas (24) (25) is below the predetermined threshold (step 13), or when the reply signal cannot be received (step 9), the signal side control is transmitted. The means (21) operates the antenna converter (23) to switch the transmission signal side antenna from the transmission signal side antenna 1 (24) to the transmission signal side antenna 2 (25) (step 15, action 6).

After the antenna is switched, the transmission signal side control means (21) inputs the locking information in sequence for each predetermined time (step 4), and once the predetermined measurement value transmission timing comes (step 5), the slave transmission signal is transmitted. The side circuit (22) transmits a signal including the lock information and the reply request via the transmission signal side antenna 2 (25) (step 8, action 7).

Once the receiving signal side means (40) receives the signal including the response request (ACT 8), the receiving signal side control means (41) will reply from the receiving signal side circuit (42) via the receiving signal side antenna (43) to include the receiving signal. Intensity value (RSSI) signal (answer signal) (action 9).

Once the transmitting signal side means (20) receives the reply signal via the transmitting signal side antenna 2 (25) (step 9, action 10), the RSSI integrated value (RSSI2) of the transmitting signal side antenna 2 (25) is updated (step 11). ). RSSI2 is calculated by accumulating the received RSSI by the value of the original RSSI2 (initially zero).

When the response signal is received within the specified time and the RSSI values of the two transmitting signal side antennas (24) (25) do not meet the specified conditions (step 13), or when the reply signal cannot be received (step 9), the signal side control means is transmitted ( 21) The antenna converter (23) is operated, and the transmission signal side antenna is again converted from the transmission signal side antenna 2 (25) to the transmission signal side antenna 1 (24) (step 15, action 11).

In the above steps, when the signal including the reply request transmitted from any one of the transmitting signal side antennas (24) (25) does not reach the receiving signal side means (40) (for example, action 13), since there is no means for receiving the signal side (40) The reply signal (No in step 9), so the addition of the RSSI value does not proceed (ACT 14).

In step 13, when the sum of the RSSI integrated values of the two transmitting signal side antennas (24) (25) is larger than the predetermined threshold value, the transmitting signal side control means (21) compares the two transmitting signal side antennas (24) ( 25) RSSI value (step 14, action 25), select the transmit signal side antenna (24) or (25) with a large RSSI value, and operate the antenna converter (23), and fixed the transmit signal side antenna (24) or ( 25) (Step 16, Step 17, Action 26).

For example, when the transmission signal side antenna 2 (25) is selected and fixed, the subsequent transmission signal is performed by the transmission signal side antenna 2 (25) (step 6, step 7). Further, after the transmission signal side antenna is fixed, the response signal is not included in the signal transmitted from the transmission signal side means (20) (Act 27 to Action 32).

The receiving signal side means (40) is a signal for receiving a torque value transmitted from the transmitting signal side means (20), stored in the memory, or displayed on the display means (45). In addition, it can also be displayed in conjunction with the number of the signal side antenna or the RSSI value.

In the above, when the torque value does not change for a predetermined period of time, or if the rising torque value decreases after the peak value, it is judged that the locking operation once is completed, and the transmission of the signal including the torque value is stopped. Further, once the second new lock is performed and the torque value is equal to or greater than the predetermined threshold (step 1), the above-described flow may be performed again.

In the present embodiment, in step 13, the measurement of the received signal strength (operations 1 to 24) is performed under the condition that the sum of the RSSI integrated values of the two antennas is larger than the predetermined threshold value. The step of measuring the received signal strength may be one time, or until any RSSI value forms a predetermined threshold or more. Further, the number of times of the measurement step of receiving the signal strength may be determined, and at the stage of reaching the number of times, the credit antenna having the highest RSSI integrated value is selected and fixed.

According to the wireless communication system (10) of the present invention, the signals are received sequentially from the respective transmitting signal side antennas until the transmitting signal side antennas having the highest received signal strength among the plurality of transmitting signal side antennas are selected, but the signals are transmitted once. When the side antenna is selected, the signal can be fixedly received from the transmitting signal side antenna, so that the communication state can be established in advance, the battery consumption can be suppressed, and the occupancy rate of the wireless frequency space can be reduced.

In addition, in the above embodiment, the receiving signal side means (40) is wirelessly communicated with the transmitting signal side means (20) of the one seat, but may also constitute wireless communication with the plurality of transmitting signal side means (40), and the transmitting and receiving are included. The system of RSSI signals.

Further, a plurality of reception signal side antennas (23) may be provided in the reception signal side means (40), and the reception signal side antenna having the best communication quality may be selected by the same method as the transmission signal side means (20) ( 23) A combination of a combination of a signal side antenna (24) (25).

The above embodiment is described by applying the antenna conversion method of the wireless communication system of the present invention to the locking torque measuring unit, but the application of the present invention is of course not limited to the embodiment.

The present invention is useful as an antenna conversion method for a wireless communication system having a plurality of transmission signal side antennas.

1, 2. . . Transmitting signal side antenna

10. . . Wireless communication system

20. . . Send signal side means

twenty one. . . Send signal side control

twenty two. . . Transmitting signal side circuit

twenty three. . . Antenna converter

24, 25. . . Transmitting signal side antenna

30. . . Locking torque measuring unit

31. . . Detection sensor

32. . . Amplifier

33. . . A/D converter

35‧‧‧Shell

36‧‧‧ Display means

40‧‧‧ Receiving signal side means

41‧‧‧ Receiving signal side control means

42‧‧‧ Receiving signal side circuit

43‧‧‧ Receive signal side antenna

45‧‧‧ Display means

50‧‧‧ shaft

51‧‧‧ front-end socket

1 is a block diagram of a wireless communication system of the present invention.

Fig. 2 is an explanatory view showing an embodiment of a locking torque measuring unit in which the transmission signal side means of the present invention is mounted on a locker.

3 is a flow chart of an antenna conversion method of the wireless communication system of the present invention.

4 is a sequence diagram of an antenna conversion method of the wireless communication system of the present invention.

10. . . Wireless communication system

20. . . Send signal side means

twenty one. . . Send signal side control

twenty two. . . Transmitting signal side circuit

twenty three. . . Antenna converter

24,25. . . Transmitting signal side antenna

31. . . Detection sensor

32. . . Amplifier

33. . . A/D converter

36. . . Display means

40. . . Receiving signal side means

41. . . Receive signal side control

42. . . Receive signal side circuit

43. . . Receive signal side antenna

45. . . Display means

Claims (5)

An antenna conversion method for a wireless communication system includes: a signal side device (20) having a transmission signal side circuit (22) for transmitting and receiving signals and a plurality of transmission signal side antennas for transmitting and receiving signals (24) (25), and an antenna converter (23) that converts any one of the plurality of transmission signal side antennas (24) (25) to the transmission signal side circuit (22), and controls the transmission signal side The transmitting signal side control means (21) of the circuit (22) and the antenna converter (23), and the transmitting signal side circuit (22) is capable of transmitting the signal including the reply request and transmitting and receiving other signals; and receiving the signal side means (40), comprising: a receiving signal side circuit (42) for transmitting and receiving signals with the transmitting signal side means (20), and a receiving signal side antenna (43) connected to the receiving signal side circuit (42) And controlling the receiving signal side control means (41) of the receiving signal side circuit (42), and receiving the signal side controlling means (41) receiving the signal including the reply request from the transmitting signal side means (20) The side circuit (42) sends a reply signal, its characteristics The method includes: a receiving signal strength measuring step, comprising: transmitting a signal side control means (21) to operate by being capable of connecting any one of the transmitting signal side antenna (24) (25) and the transmitting signal side circuit (22) The antenna converter (23) transmits a signal including the response request from the transmission signal side circuit (22) via the transmission signal side antenna, and stands by in the receiving state of the response signal, and receives the response after receiving the signal side control means (41). Claim The signal is sent from the receiving signal side circuit (42) via the receiving signal side antenna (43) to the response signal including the received signal strength value, and the transmitting signal side control means (21) is for storing the aforementioned transmitting signal side antenna within the determined time. The step of receiving the received signal strength of the reply signal, and operating the antenna converter (23), performing the foregoing steps for all the remaining signal side antennas (24) (25) to obtain the antenna for all the transmitted signals (24) (25) The step of receiving the signal strength; the transmitting signal side control means (21), comparing the received signal strengths of all the transmitted signal side antennas (24) (25), and determining the transmission signal side antenna having the highest received signal strength And the transmitting signal side control means (21) operates the antenna converter (23) in such a manner as to be able to connect the transmitted signal side antenna and the transmission signal side circuit (22) having the highest received signal strength determined, and fixed a step of transmitting a signal side antenna; and transmitting a signal side control means (21) for transmitting a signal from a subsequent transmission signal side circuit (22) via the fixed transmission signal side antenna step. The antenna conversion method of the wireless communication system according to claim 1, wherein the receiving signal strength measuring step is repeated plural times, and the transmitting signal side controlling means (21) is for each transmitting signal side antenna (24) (25) To compare the received signal strength. The antenna conversion method of the wireless communication system according to claim 1 or 2, wherein the transmission signal side antenna (24) (25) is arranged at a predetermined interval in a circumferential direction of the rotatable member, and receives the signal strength. The measuring step is performed in a state where the rotatable member is stopped or almost stopped. An antenna conversion method of a wireless communication system according to claim 3, wherein the rotatable member is a torsion locking unit (30) mounted to a rotating shaft (50) of the locking machine. An antenna conversion method of a wireless communication system according to claim 1 or 2, wherein the transmission signal side means (20) is battery driven.